ケールダール法に依る鐵及鋼窒素定量法 : (第 1 報)微量アンモニア蒸溜裝置

概要

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Nitrogen in iron and steel was converted to ammonia and it was distilled by the apparatus shown in the Japanese text. It was very difficult to distil a very small quantity of ammonia in the presence of a large amount of alkali and iron hydroxide, and it was necessary to use a special distillation apparatus of hard glass. The apparatus was of pylex, telex, or other special hard glass such as Nakano-kositu, Ogumakositu or Numazaki-kositu. In Figure 2, (4) is a 1000 ml distillation flask containing NH_3 and a large amount of NaOH and ferrous hydroxide, (1) is a trap having two bulbs (2) and (3) to prevent the carrying over of alkali, (5) is a condenser which is not dissolved by steam and ammonia, (14) is a 300 ml receiving flask, in which a measured amount of standard acid is added. In order to test the purity of distilled water obtained by this apparatus the conductivity was measured and the results are shown in the Japanese text paper.
社団法人日本鉄鋼協会の論文
1940-01-25